Neutralizing induction from alternating-current railways.



W. S. BRALLEY. NEUMALIZING INDUGTION FROM ALTERNATING CURRENT RAILWAYS.

Fig. 5.

Witnesses:

APPLICATION PIL'ED AUG. 7, 1907.

Patented Dec. 5, 1911.

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Inventor Walter S. Bra! leg Y W. S. BRALLEY. NEUTBALIZING mnuc'rmn momALTERNATING CURRENT BAILWAYS.

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Law-4% Witnesses Inventor 4 Walter S. Bralley,

Patented Dec. 5, 1911.

UNITED sinuous PATENT OFFICE.

WALTER S. BRALLEY, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Dec. 5, 1911.

Application filed August '7. 1907. Serial No. 387,431.

T 0 all whom it may concern:

Be it known that l, lVAL'rna S. BRALLEY, acitixen of the United States,residing at Schenectady. county of Schenectady, State of New York, hareinvented certain new and usetul improvements in Neutralizing Induction'l rom Alternating-Current Railaye, ot which the following is a speciti:ation.

My invention relates to the protection of conductors against inductionfrom alternating-current railways, employing the rails as returnconductor tor the power-current and consists in placing near to theconductor to he protected at neutralizing conductor connected in shuntto the ra ls. It the proper portion of the power-currcut tlows throughthis neutralizing olltluctor. it will neutral ize the electromagneticinductive ellects ot the currents in trolley and rails. Furthe more.since the neutralizing wire is connect ed to the rails.-or. in other wods. ground cd-it will vserve partly to neutralize cle trostaticiuductiou since, by bringing the ground near to the conductor to heprotecteot it brings the electrostatic induced voltage on thatconductornear to earth po- 'tential. i

My invei'ttion comt'u'ises certain features, which will best heunderstood by reference to the following specitication and accompanyingdrawings, in whi h-- Figure l shows diagramuultically analtern.-tting-current railway provided with neutralizing conductorsarranged in accordauco with my invention; Fig. shows a. modification ofthe same; Fig. 3 shows a further modification; and Fig. tshows asuitable method of locating the neutralizing ctnuluctors efieetively.

In Fig. .1, A. represents the trolley-wire, B the rails, and C theconductors to be pro tected. 1) represents the neutralizing conductors.which are connected in shunt to the ails B. Resistances E may beinserted in the connections between the conductors l) and the rails, orin the conductors themselves, in order to produce the proper divisionot' current between the neutralizing conductor and the rails, in casethe division which would be produced by their relative in'ipedancesshould not give the proper current in the neutralizing conductors. Itwill he seen from Fig. 1 that if a proper portion of the power-currentis returned through the neutralizing conductors D, the electromagneticinduction on the conductors C of the power-current in the trolley-wireand rails I) will he neutralized. Furthermore, since the conductors Dare connected to the rails. and consequently are grounded, the inducedelectrostatic voltage of conductors is hrought near to earth potential.

Fig. 2 shows a modification, in. which a reactive winding F inserted inseries With the rails in order to increase the proportion of currentthrough the neutralizing conductors D.

Fig. 3 shows an arrangement in which series transformers are employedfor insuring the proper division of current between neutralizingeonductors and rails. Each transt'ormer G has one winding in series withthe rails and the other in series with the neutralizing conductors.

In Fig. 4-, a suitable location for the neutralizing conductors isshown. In this figure (7 (7 represent the insulators on which a recarried the telegraph or telephone wires adjacent to the railway whichare to be protected 'trom induction disturbances. D D representiusulatt'irs carrying the neutralizinneonthu-tora. in order that thesemay he etl'ective with respect to all the telephone or telegraph wires,these insulators are so placed that (ho are as nearly equidistant aspossible, from the several wires to be protected.

ll'hat I claim as new and desire to secure by Letters Patent. of theUnited States, is,

1. in combination with an alternatingcurrent railway employing the railsas re: turn conductor tor the power-current, as a means for protectingadjacent conductors from induction, a neutralizing conductor placed nearthe conductor to be protected and connected in. shunt to the rails.

In combination with an alternatingcurreut railway employing the rails asre turn conductor for the power-current, as a means for protectingadjacent conductors from induction, a neutralizing conductor placed nearthe conductor to be protected and connected in shout to the rails, and

means for producing a. division of currenthetween the rails and saidneutralizing con;v

ductor (littering from that which would be produced by their relativeimpediinees.

Incomhination with an alternatingcurrent railway employing the rails asreturn conductor for the power-current, as a means for protectingadjacent conductors from induction, a neutralizing conductor placed nearthe conductor to be protected and connected in shunt to the rails, andreactive windings controlling the division of current between the railsand said neutralizing conductor.

4. In combination with an alternatingcurrent railway employing the railsas return conductor for the power-current, as a means for protectingadjacent conductors from induction, a neutralizing conductor placed nearthe conductor to be protected and connected in shunt to the rails, and atransformer havi its windings in series with the rails an with saidneutralizing conductor respectively.

5, Means to neutralize the inducing eflect of a power wire onneighboring lines of transmission, said means comprising a conductorplaced in the neighborhood of the lines of transmission and connected inshunt with the return-of said power wire.

6. In combination with a series of lines useful for transmittingintelligence, a power wire positioned in the inducing region of saidlines, a return for said power wire, a shunt circuit for said return,said shunt circuit positioned in the neighborhood of said lines oftransmission.

7, Means to neutralize the inducing effect of a power wire onneighboring lines of transmission, said means embracing a conductorpositioned near said lines of transmission, said conductor forming ashunt around the return for said power wire, and means in said shunt toproduce the proper division of current between the conductor and saidreturn.

8. In a system of power transmission wherein the rails of travel are thereturn, means to neutralize the inducing effect of said power wire onneighboring lines of transmission, said means comprising a conductorpositioned near said lines of trans mission, said conductor shuntingpart of said rails of travel.

In witness whereof, I have hereunto set my hand this 3rd day of August,1907.

. WALTER S. BRALLEY.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

